Benjamin p



(No Model.)

B. Ff LIBBY.

KNOB ATTAGHMENT.- No. 339,440.l Patented Apr. 6, 1886.

`UEITTETD STATES PATENT EEicE.

BENJMIN LIBBY, OF SOUTH NORVALK, CONNECTICUT, ASSIGNOR TO THE NORYVALKLOCK COMPANY, OF SAME PLACE.

KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 339,440, dated April 6,1886.

Application filed November Q3, 1885. Serial No. 183,594. (No'model.)

To @ZZ whom. it may concern.:

Be it known that I, BENJAMIN F. LIBBY, of South Norwalk, in the countyof Fairfield and State of Connecticut, have invented new Improvements inKnob Attachments; and I do hereby declare the following, when taken inconnection with accompanying drawings, and the letters of referencemarked thereon, to be a full, clear, and exact description of the same,and which said drawings constitute part of this specification, andrepresent, in-

Figure '1., a side view of the knob, showing vertical central section ofthe rose; Fig. 2, a rear view oi.' the rose, showing the knob secured,Fig. 3,11 side view ofthe knob detached; Fig. 4, the securing-forkdetached; Fig. 5, a modiiication ol the fork.

This invention relates to an improvement in a device for securing oneknob of a pair which is made adjustable on the spindle to adapt it todoors of different thicknesses, the object being to make a iirin andsecure attachment independent oi' the spindle; and it consists inconstructing the rose with a sleeve to receive the neck ofthe knob,theneck extended through the rose, and constructed upon its projecting endwith an annular groove, combined with a fork removably set against abearing upon the inside of the rose, the prongs of the fork resting inthe groove in the neck oi the knob, and as more fully hereinafterdescribed.

In illustrating my invention I show the rose as of an oblong shape, suchas used where the escutcheon for the key-hole is made in the same piecewith the rose; but the shape oi the rose is immaterial and may be any ofthe known shapes or styles.

A represents the rose. It is constructed with an outwardly-projectingsleeve, B, the internal diameter of which corresponds to the neck C ofthe knob D, in length corresponding to that of the neck of the knob, sothat the knob will take a bearing against the outer end of the sleeve.The neck and knob are united in the usual manner. The neck itself isconstructed to extend through the rose, and project upon the reverseside,and is vfree for rotation in the sleeve. Near the inner end and inthe projecting portion of the neck an annular groove,

c, is formed, which should be substantially iiush with the plane of theinside of the rose.

E is the. fork, which is constructed with a bifurcated end having twoprongs, b Z). (See Fig. 4.) The prongs correspond to the groove a in theneck of the knob in thickness and in distance between them, so that theymay set within the groove, as seen in Fig. 2.

In coupling the knob with the rose the neck is passed through thesleeve, and then the fork E introduced to embrace the neck in the groovea, as seen in Fig. 2, the body of the fork lying upon the inside of therose, and when so coupled the knob,while free for rotation, cannot bewithdrawn. The fork should be prevented from rotation with the knob,andto do this I construct the rose upon the inside with a lug or bearing,d, against which the body of the fork may abut when in posit-ion, thebody of the fork being sufficiently elastic to spring over the abutmentand into place, and when there is secured against displacement, exceptby the application of some instrument for the purpose. The fork may,however, he otherwise secured to prevent its rotation,say, as by a screwthrough the fork into the rose, as indicated in broken lines, Fig. 2; orthe prongs of the fork may be made elastic, the opening into the forkbetween the lugs slightly less in diameter than the diameter of the neckat the bottom of the groove, as seen in Fig. 5, and so that the fork maybe forced into the groove, the prongs embracing the neck inthe groove soas to prevent accidental displacement. In that case the fork does notrequire to be secured to the knob, but maybe left free to revolve withthe knob or remain stationary,as the case may be. I, however, prefer thefixed fork, as first described. In this case, as in other constructionswhere the knob is secured to the rose instead of the spindle, the roseis constructed to be strongly secured to the door either by screwsthrough the rose on the one side into the rose on the opposite side orotherwise, constructions which are well known and do not require to bedescribed in this specilication. By this construction the knob issupported entirely by the rose-that is to say, the knob rests againstthe outer end of the sleeve i take a bearing, the necklextending throughthe rose constructed with an annular groove inside the rose, and with afork adapted to rest in said groove and take a bearing upon the insideofthe rose, so that the knob is supported between the outer end of thesleeve on the rose and the inner surface of the rose.

I claim The combination of the rose A,constructed with the tubularsleeve B, the knob D, con structed with the neck C, corresponding to andso as to revolve freely in said sleeve, the neck of the knob extendingthrough the rose, and at its inner end constructed with an annulargroove, a, a fork, E, adapted to embrace the neck oi' the knob withinsaid groove upon the inside of the rose, 'and the inside of the roseprovided with a bearing against which said fork may rest to secure it inplace, sub stantially as described.

BENJAMIN F. LIBBY.

Vitnesses:

E. BEARD, JACOB M. LAYToN.

